function [] = assert2(A, B,Z,X, s1,s)
X
Z
    if(X == Z)
        fprintf('\tYes: %s*%s =>',mat2str(A),mat2str(B));
        print_matrix(Z, s1, s);
    else
        fprintf('\tNo : %s*%s =>',mat2str(A),mat2str(B));
        print_matrix(Z, s1, s);
        
        pad(s-12);
        fprintf('Correct is:');
        print_matrix(X, s1, s);
    end
end
